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Definitions:
Noun
                                                
                        
                            quantum field theory
                        
                                                
                                                    
                
                    
                    Definition: the branch of quantum physics that is concerned with the theory of fields; it was motivated by the question of how an atom radiates light as its electrons jump from excited states
Definition: A theory of quantum fields; the result of applying second quantization to Classical Relativistic Field Theory.